Issue 9, 2014

Base stable quaternary ammonium ionic liquids

Abstract

Ionic liquids with the bis(2-ethylhexyl)dimethylammonium cation, [BEDMA]+, were prepared by a halide-free route starting from the readily available secondary amine bis(2-ethylhexyl)amine. The following anions were considered: chloride, bromide, iodide, nitrate, hydrogensulphate, dihydrogenphosphate, formate, acetate, propionate, trifluoroacetate, methyl sulphate, methanesulphonate, tosylate, isonicotinate, nicotinate and picolinate. Several of the compounds are room-temperature ionic liquids, albeit with a high viscosity. All ionic liquids are soluble in water. The ionic liquids are very stable in strongly alkaline medium. No signs of decomposition could be observed by contact of the chloride ionic liquid with 50 wt% sodium hydroxide, even after prolonged heating at 80 °C. The high stability against strong bases is attributed to the branched structure of the quaternary ammonium cation, which blocks the Hofmann elimination reaction.

Graphical abstract: Base stable quaternary ammonium ionic liquids

Supplementary files

Article information

Article type
Paper
Submitted
14 Sep 2013
Accepted
02 Dec 2013
First published
02 Dec 2013

RSC Adv., 2014,4, 4472-4477

Base stable quaternary ammonium ionic liquids

K. C. Lethesh, W. Dehaen and K. Binnemans, RSC Adv., 2014, 4, 4472 DOI: 10.1039/C3RA45126G

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